46 



MORPHOLOGY. 



end of the manubrium was divided into two by a shallow strangulation. The peculiar mode in 

 which the generative elements are developed in the manubrium of Dipurena, a nearly allied "-enus 

 described by M'Crady," would seem to afford an example of an analogous phenomenon. 



Fig. 16. 



Male gonophore olSuden. 

 drhtm, showing the develop, 

 ment of the spermatogenous 

 tis3ue at intervals between 

 the ectoderm and endoderm. 



Fig. 17. 



Medusa {^Sa/i'sia strangulata, AUm., provisionally) of unknown 

 tropbosome. 



a, very extensile manubrium opening at its proximal end into 

 a special cavity, tbe atrium ; b, h, b, male elements developed 

 at intervals between tbe ectoderm aud endoderm of tbe manu- 

 brium ; c, ocellus. 



The gonophore may be borne upon a distinct peduncle, Avhich may be simple {Stjucoryne 

 eximia, &c.) or branched {Tubidaria iiidivisa, Cori/moqjha nutans, &c.), each branch then bearing 

 a gonophore on its summit; or the peduncle may be obsolete, and the gonophore become 

 sessile {Laomedea Jlexuosa, &c.) 



The gonophores, whether plianerocodonic or adelocodonic, may be destitute of any farther 



^ MX'rady, op. cit., p. 13u 



